All donations are securely managed through PayPal. Amounts donated are not published online.
Many thanks for your kind support.
Model Boats Website Team
April 2017: 21 people March 2017: 9 people February 2017: 12 people January 2017: 37 people December 2016: 2 people November 2016: 2 people October 2016: 8 people September 2016: 4 people August 2016: 5 people
Vosper 46 RAF Crash Tender Kit plus 95% of the items required to complete the model. Brand new kit, motor, prop shaft, batteries, controller, glue’s etc. Unfortunately due to an unforeseen illness It’s looking like I will not be able to start the build so if anyone would be interested in buying the lot at a discounted price please message me? I could travel up to 100 miles from DE15 to deliver or meet to complete a deal if anyone is interested? Thanks, Ian. Courier may be possible at cost. WHATS INCLUDED: The Vosper 46 RAF Crash Tender Kit Boat ESC Programming Card 90A Boat ESC 4A SBEC 11.1V 5000mAh 35C continuous discharge lipo battery x 2 Tornado Thumper V2 4260/06 500KV - Brushless Outrunner RC Motor Canopy Glue Formula 560 Prop Shaft - 13" Maxidrive ( 8mm Tube/5mm Inner ) Universal Joint Propeller Propshaft Oiler Clamp Kit XL Brass Rudder Waterproof Toggle Switch Propshaft Grease ZAP Z Poxy Dual Power iMAX B6 AC Lipo NiMh RC Battery Balance Charger/Discharger Woven Glass Twill 100g 1m Wide x 3mtrs 30 Amp Inline Mini Blade Fuse Holder & Fuse (Splashproof) Flexible Silicone Wire Cable 14AWG Red & Black 5 Pairs XT-60 Male Female Lipo Battery Connectors Plugs I believe this is an amazing buy at £295
Hi from freezing Munich 🤔 Balancing is not just "good practise" it is a safety essential!! Otherwise the "good" cells can be overcharged and overheat, with the consequences we have seen with Boeing and Samsung 😲 That is why you need a charger specifically designed for LiPos, and why one should pay more for a decent LiPo which has better matched cells from the start 😉 Cheers Doug 😎
to add to that, its also regarded as good practise to balance charge the lipo, using the balance lead, and and appropriate lipo charger, I believe all lipo chargers have this facility. This means the cells are all equal when fully charged, and you can view this on the charger display. It also means that none of the cells will be overcharged, and risk fire etc. The down side is that as the charger enters the final stage of balancing and achieving fully charged, it takes a while, as the current reduces, so patience is a virtue, and never leave unattended whilst charging, that applies to all chemistry, I have seem a nihm explode due to over charging, its not just this lipo myth that is risky!😉
Hi Patto, Sounds like you aught to be running on a decent lipo. The motor is probably taking more amps out of the battery than it can maintain. Lipos are much much lighter than lead acid and can give a higher discharge rate. The dicharge rate is the 'C' rating of the lipo, the higher the number the greater the discharge capacity. If the 'C' rating is too low the battery will start swelling up and its life expectancy greatly reduced. Go for the highest you can afford with the greatest capacity and always use an alarm with the battery, it plugs into the little white plug and can be set so when the battery gets to a set voltage an alarm sounds indicating to stop using it until it is recharged. A 3 cell will give you the required 12volts. The 'C' rating now goes up to 130 in the more expensive lipos but an 80 will probably suffice. The higher the amperage of the lipo the longer running you will get. A 2500 may only give you 8-10 minutes whilst a 4500 (cost just under £50) will give you up to 20 mins. You will have to check your speed controller to make sure it is compatable with lipos, a few are not. Remember you will need a balanced Lipo charger, I only spend about £20 or less but they only charge lipos, quite often the more expensive ones will charge a variety of battery types. I'm not an expert on electronics my knowledge comes through personel experience. With the lipo you will get better performance as the lead acid weighs the boat down. Good luck.
Hi Patto I agree with what has already been posted, but it would help if we knew the size and type of prop you are running with your brushless motor. Fast large racing props do not work well with brushless unless your battery can provide the very heavy sustained current required. As Haverlock suggests a Wattmeter will allow you to select the best prop for your set up. LiPo power will give you all the speed you need but at an initial high cost as they require special chargers and correct management. You could use NiMh batteries which are lighter than SLA and are more suited to high discharge currents. You can get these in 12v packs and 5000mAhr would be a good starting point. If your motor is cutting out it is more likely the ESC is the culprit due to too high current draw. Another possibility is that the propshaft is too tight, it should turn freely with no tight spots and have thrust washers at both ends. Dave
A quick check on the specs of your motor /esc combo states its good up to 5s LiPo. So step 1 get a watt meter ( cheaper than burned out motors ) Step 2 check with your bank manager ( or wife) for available funds Step 3 buy the biggest 4s or 5s LiPo you can fit in the available space. you will also need a LiPo charger do not attempt to skimp on that step LiPo batteries need special handling and can be spectacular if you do it wrong. You have not mentioned the prop your using if you use the watt meter you can play around with different props so the current used by your setup heads towards the point you pick twixt performance / running time. If you do go LiPo you will also need a battery monitor part of the careful handing includes not discharging them below around 3.3 Volts per cell. 3s =3cells 4s=4cells etc. So if you go 4s then you should not discharge below 13.2V. http://www.rchelicopterfun.com /rc-lipo-batteries.html http://www.4-max.co.uk/pdf/pro long-life-lipo.pdf some text on the care and feeding of LiPo batteries. The reason for your problem is a simple case of battery chemistry a lead acid accumulator cannot deliver a high current for extended periods gasses on the plates prevent the electrolyte coming in contact so the battery loses power. After a while the gasses are re dissolved and the battery can then go on providing power. Nothing wrong with the battery its just a case of wrong tool for the job.
Hi I avoided mentioning LiPo as you are handing the completed model to possibly a novice. NiMh would be my choice and depending on the budget I would get the highest amp and voltage you can manage. There may be a min voltage requirement depending on the ESC you choose. She will also need a charger for the NiMh and possibly the Tx/Rx if no BEC on the ESC. Sounds like you will achieve your goal and I am sure the lady concerned will be well pleased. Dave
Hi Keith I see you have a 2 cell Lipo battery of 5100Ma. The charger shows Li 2S charging at 1amp with the overall voltage of 7.43volts on the charge so far. Your charger need to be set to the correct battery type if your battery is to be fully charged safely. You have a balance lead connected so the charger will take care of the process if correctly set up for the battery. There are several flavours of Li batteries so your charger need to be set for LiPo which appears to be the 2nd setting. I can't quite read the writing but suspect it is Lion, LiPo and LiFe. Your charger supports charging up the 5amp and I suggest you use this for your battery which is 5.1amp. As the charge proceeds your charger will reduce the current as full capacity is reached. My charger then flashes a message to say charge end and stops any current flow. Your may have a similar message or indication. When fully charged your battery will have a voltage of about 8.4v. You should not discharge below 6.3v which is probably where your ESC shut down power to your model. LiPos should not be stored fully charged. The safe storage voltage is 3.7v per cell or 7.4v in your case. There may be a setting on your charger that allows you to charge to this level. If you are still unsure please ask. A copy of the charger manual would help. Hope this helps.😁
When I charge my battery to 7.5 v I only get about 10 minutes running time. When I go to recharge the battery the charger tells me that it is sitting on 6.2 v. My question is is the time of 10 minutes usual,if not what if anything I am doing is wrong. Thankyou in advance
Hi Dave, good to hear from you (sorry to hijack thread). 4 footer came out two years ago, Huntsman once in 2016, Its over 3 years since the 3 footer got wet! Orca once in 2016. I did build the PCF which I really liked, but it went immediately as too many people messaged saying they wanted it, so it funded some RC plane gear, which I am really into now. I sold a load of bits and bobs at the Blackpool show a few months ago, didn't renew with St Helens in 2015, or 2016, and wont this year. However.... Robs excellent blog has got me interested again, and Stephen kindly did a bespoke 3 d printing project on something rc related, info and pics to follow when its finished! Back on track... George, I'm going to advise only things I have done, or used, I'm not one to say do this, or that, but actually I have not done it myself. No doubt others will disagree, but this is my opinion only. Best performance in terms of speed is brushless, and lipo. Forget fear of fire and explosions, this only happens with abuse, and they are the common use with rc planes, helicopters, cars, its only boats that are really stuck in the dark ages with technology that have this big fear of brushless systems and lipos! However, to get initially set up, they do take more understanding and initial cash outlay, as you need a specific charger for one, and you do need to understand what you are doing. Brushless motors will unlease the power far more than brushed, and are usually lighter. https://hobbyking.com/en_us/tu rnigy-t600-brushless-outrunner -for-600-heli-880kv.html This motor is an example, there are much cheaper ones with similar specs, but I have used this motor in various applications, the most similar to your boat being my large Huntsman, with this motor on 6 cells lipo I achieved 25mph, but speed might not be what you want. So if you have the fast engine in your car, say a v12 Ferrari, if you run it on cheap fuel, it wont perform, same here, nicads and nimhs batteries are easy to maintain, you can drain them dead flat, but will give cheap fuel performance, like a bath tap trickling when the shower is on at the same time, and as they are dying technology, are expensive for what they are. Lipo is like turning up both bath taps and the force floods out, but now the tank will empty quicker, so you have less run time 😊 If brushless, its a specific speed controller, https://hobbyking.com/en_us/ho bbyking-50a-boat-esc-4a-ubec.h tml and you pay extra for reversing (other rc disciplines don't need reverse) and a marine esc might need to be water cooled, however, decent brushed motor speed controllers are not exactly cheap, so now you know why budget is important to give advice, you could be spending £100 here just to get up and running. Look at my 4 foot fireboat build blog, as its twin screw (personally a boat this size is better twin screw) you can get by with cheaper motors, mine where £30 the pair, I use lipo for all my boats, so I have the batteries, and are familiar with using them, the speed controllers where about £40 the pair, and if I was buying batts then probably another £40, so it all adds up! Single screw, less batteries. You could power with nimhs, and it might be acceptable ,performance for you. If your location is Ellesmere Port, have a Sunday morning drive to Hoylake, then New Brighton, and maybe take in St Helens Liverpool, and Runcorn, see boats in action, see what sort of performance suits you, and rethink the budget, what do you want to spend? Then you need the transmitter and receiver (if you don't already have these) the fittings (see Robs build blog) a prop shaft, and a suitable propeller I am North Wirral, you are more than welcome to come and have a chat and see some boats, but unfortunately I'm deep into another rc project for the next few weeks, once that is done I can share some time, if you want! Don't worry, I'm not all about speed, I can do brushed motors and nimhs and get a result, Any questions, just ask, Paul PS... Looks like a nice clean boat you have there😉
Hi George I have seen the earlier posts and can't add anything to the advice given. However if you are going to LiPo's please ask before you buy batteries or chargers. If you are wanting to go into fast speed and cost really isn't a factor, then Paul will give you all the help and advice you need. His Crash Tender is both detailed and fast👍. It won't be cheap but if speed is what you wan't then anything is possible. Paul Glad to see you are back with the model boats, may I see you at St Helens open day? Cheers Dave
within reason you are not limited to LiPo batteries. My reasons for pointing you in their direction are their ability to supply current for lower weights. I am not expert in their usage having only playing with them for a short time BUT once you take the plunge they are like everything else use some common sense and they are fine. Charging requires a LiPo charger http://www.ebay.co.uk/itm/Dual -Power-iMAX-B6-AC-LCD-Screen-D igital-RC-Lipo-NiMh-Battery-Ba lance-Charger-/112221546397?ha sh=item1a20ece79d:g:mloAAOSwo4 pYPzgr That's the kind I use ( will charge nimh nicad and lead acid also) as to batteries some is good more is better ~laughs~ Its a case of run times at the current dumping your using I have some 5500Mah 3s ( nominal 12v ) lipo you can link batteries in parallel to get increased runtimes. One important thing to remember is not to run a LiPo down to too low a voltage the limit us usually given as 3.3v per cell so a 3s will give you a 9.9 v low point. IN practice aim for a higher cut off voltage. Depending on your radio setup ( I use frsky ) you may be able to have your battery voltages echoed to your transmitter. The charger will charge to full and also charge to storage voltages LiPo batteries must not be stored at full charge. Probably there is a lot more you need to know Dave M is way more expert than I.
Havelock thanks for the in depth reply much appreciated when every i hear lipo i get a bit worried of fire and explosion but I agree with what your saying could you help me out with what sort or charger and battery i would need to go into the world of brushless
Just wanted to thank you for posting all the valuable information on your build. I'm just getting back into the hobby after too many years away and appreciate the construction details that you include. It certainly appears that suppliers and craftsman in the UK are much more plentiful and involved in the hobby than I have found here in the US to date. I just started a Blue Jacket lobster boat to get my feet wet again but have my eye on a Speedline or Model Slipway Tamar Class Life Boat. Looking forward to more posts! Frank